Vault 15 is too open, the location should be something like themepark or waterworks
Tobacco farm should fit your requirements.P.S. Saying 'Boo' for not adding Soviet Union in conflict. :/
WWII so where is a polish soldiers , and polish weapons Polanns Weapons the best "STEN" "mauser" etc
Then I would have to give the nazis another weapon, too. Plus, russians don't have any fallout weapons...molotov cocktails, [scoped] hunting rifle being mosin-nagant, and m60 for their machineguns. Not enough weapons...ppsh couldn't be lsw, nor an assault rifle, nor anything else...all weapons are like that. Their pistol is not a deagle, 10mm, or mauser...etc. You get my point, Fear. Of course, I don't know ALL their weapons...my main sources are a couple of books, which all have similar information.
For the lack of better sources at hand, here you go
I have been told there is some Fallout Tactics mod with WWII equipment. Go play that online instead of trying to make something impossible here Just my humble opinion, of course - It's ok if you want to organize an event but I think this particular one is hard to organize and doesn't fit in the Fallout world, at all.